(19)
(11) EP 2 455 772 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
10.10.2012 Bulletin 2012/41

(43) Date of publication A2:
23.05.2012 Bulletin 2012/21

(21) Application number: 12000882.6

(22) Date of filing: 03.06.2008
(51) International Patent Classification (IPC): 
G01R 31/34(2006.01)
G05B 23/02(2006.01)
 G01M 13/04(2006.01)
(84) Designated Contracting States:
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MT NL NO PL PT RO SE SI SK TR

(30) Priority: 04.06.2007 US 932742 P

(62) Application number of the earlier application in accordance with Art. 76 EPC:
08770017.5 / 2156159

(71) Applicant: Eaton Corporation
Cleveland, Ohio 44114-2584 (US)

(72) Inventors:
  • Zhou, Wei
    Los Angeles, CA 90034 (US)
  • Lu, Bin
    Cleveland, Ohio 44114-2584 (US)
  • Habetler, Thomas
    Snellville, Georgia 30078 (US)
  • Harley, Ronald
    Lawrenceville, Georgia 30044 (US)
  • Theisen, Peter
    West Bend, Wisconsin 53095 (US)

(74) Representative: Schmidbauer, Andreas Konrad 
Wagner & Geyer Patent- und Rechtsanwälte Gewürzmühlstrasse 5
80538 München
80538 München (DE)

   


(54) System and method for bearing fault detection using stator current noise cancellation


(57) A system and method for detecting incipient mechanical motor faults by way of current noise cancellation is disclosed. The system includes a controller configured to detect indicia of incipient mechanical motor faults. The controller further includes a processor programmed to receive a baseline set of current data from an operating motor and define a noise component in the baseline set of current data. The processor is also programmed to repeatedly receive real-time operating current data from the operating motor and remove the noise component from the operating current data in real-time to isolate any fault components present in the operating current data. The processor is then programmed to generate a fault index for the operating current data based on any isolated fault components.







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